Which of the following is NOT a physical indication of a rapid decompression?

Visual clarity is not a physical indication of rapid decompression. During an event of rapid decompression, the environment changes rapidly, typically leading to the presence of fogging due to moisture in the air condensing, and a significant temperature drop as the air expands and cools when it rushes out. Additionally, explosive noise is often experienced as the air pressure equalizes dramatically between the inside of a pressurized space and the external environment.

In contrast, visual clarity is often impaired in such situations. The sudden change in pressure and temperature can create fog, ice, or other visual obstructions that diminish clarity rather than enhance it, making this option the one that does not fit as a physical indication of rapid decompression.